iOS之点击通知栏跳转应用的相关页面

当远程推送通知到达应用，有3个相关的方法是用来处理这个通知的。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler 

在处理远程推送的情况下，这3个方法都干什么用的呢？请让我一一说来。

首先说说- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo这个方法。为什么呢？因为它是推送到来的时候第一个调用的方法：

当推送消息到来的时候：

（1）如果应用处于运行状态，那么这个方法就会被调用，用来处理接收到的推送消息

（2）如果应用不在运行状态。这个方法就会启动应用，并且为应用提供相应的信息（这些信息放在启动项字典里------也就是

application:willFinishLaunchingWithOptions:

或者

application:didFinishLaunchingWithOptions:

的(NSDictionary *)launchOptions这个参数里）。但是这个方法并不会被应用调用来处理这个推送信息，应用会调用

application:willFinishLaunchingWithOptions:

或者

application:didFinishLaunchingWithOptions:

这两个方法来处理接收到推送消息。

接下来说说跟- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo相似的

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler

其实
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler

的作用跟- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo是一样的。两者的区别在于：（1）
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo是iOS 3.0推出的，基于iOS 6.0 及以下的系统版本。而- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler则是在iOS 7.0推出的。基于iOS 7.0 及以上的系统版本。

（2）- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo只有在应用运行在前台的时候才会被调用。而- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler方法则无论应用运行在前台或者后台，在推送消息来到的时候都会被调用。

接下来说说- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
由前面的叙述可以知道，这个函数是在应用没有被启动的情况下，当推送消息到达的时候，由上述两个函数中的一个调用的。用来处理接收到推送消息。

最后，说说使用注意事项：
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo

和

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler这两个函数都要实现。（如果这两个函数都实现，则应用会调用- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler）

最后的最后就是说说如何实现页面的跳转：

在上述两个函数里实现页面跳转：我这里的是：有一个TabBarController的单例，当推送到达，点击通知栏，跳转到第一个标签，并且第一个标签里面的数据要刷新

//接收到远程通知就会调用 点击横幅 就相当于接收新通知

 1 - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo{
2 [XTabBarControllershared].selectedIndex =0;
3 UINavigationController *navVC = [XTabBarControllershared].childViewControllers[0];
4 UIViewController *VC = navVC.viewControllers[0];
5 if([VCrespondsToSelector:@selector(refreshData)]){
6 [VCperformSelector:@selector(refreshData)];
7 }
8 // Required ----下面是极光推送的代码
9 [APServicehandleRemoteNotification:userInfo];
10 [selfactivePushMessage:application userInfo:userInfo];
11 }

 1 - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfofetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
2     [XTabBarControllershared].selectedIndex =0;
3    UINavigationController *navVC = [XTabBarControllershared].childViewControllers[0];
4    UIViewController *VC = navVC.viewControllers[0];
5    if([VCrespondsToSelector:@selector(refreshData)]){
6         [VCperformSelector:@selector(refreshData)];
7     }
8    // iOS 7 Support Required  ---下面是极光推送的代码
9     [APServicehandleRemoteNotification:userInfo];
10     completionHandler(UIBackgroundFetchResultNewData);
11     [selfactivePushMessage:application userInfo:userInfo];
12 }